In these studies, a comprehensive assessment of the effect of the drugs «Carofertin» and «Hemobalance» on the reproductive function of oocyte donor cows was carried out. At the same time, the effect of these drugs on the biochemical parameters of blood serum, as well as on the concentration of progesterone, carotene in the experimental groups and the activity of the ovaries in the experimental animals was assessed. An increase in the activity of alkaline phosphatase in the first and third experimental groups was found, which amounted to 128.80 and 104.6 IU / L. There was also a decrease in the concentration of cholesterol in the experimental groups compared with the control. The maximum concentration of carotene was noted in the experimental group No. 1, which were injected with «Carofertin» subcutaneously, and in the experimental group No. 3, which were injected with «Carofertin» and «Hemobalance». The maximum concentration of progesterone was also noted in groups No. 3 and No. 1 and amounted to 21.98±3.03 and 17.01±9.68 nmol / l, respectively. In the course of ultrasound examination of the ovaries in experimental animals, a relationship was noted between the concentration of progesterone and the intensity of the blood supply of the corpus luteum on the ovaries in experimental animals. Subsequently, in one animal from each experimental group, oocytes were aspirated (OPU) twice with an interval of two weeks and their qualitative and quantitative characteristics were assessed. The maximum number of oocytes suitable for use was noted in the experimental group No. 3, which was injected with both study drugs.